1242921378 has 64 divisors (see below), whose sum is σ = 2616606720. Its totient is φ = 393120000.

The previous prime is 1242921373. The next prime is 1242921397. The reversal of 1242921378 is 8731292421.

It is not an unprimeable number, because it can be changed into a prime (1242921373) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3688026 + ... + 3688362.

It is an arithmetic number, because the mean of its divisors is an integer number (40884480).

Almost surely, 2^1242921378 is an apocalyptic number.

1242921378 is an abundant number, since it is smaller than the sum of its proper divisors (1373685342).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1242921378 is a wasteful number, since it uses less digits than its factorization.

1242921378 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 703.

The product of its digits is 48384, while the sum is 39.

The square root of 1242921378 is about 35255.0901005798. The cubic root of 1242921378 is about 1075.1801040947.

The spelling of 1242921378 in words is "one billion, two hundred forty-two million, nine hundred twenty-one thousand, three hundred seventy-eight".